diff --git a/.travis.yml b/.travis.yml
index a9e7d689..435a134d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,7 @@
 language: php
 sudo: false
+# only needed for PHP 5.5 support as of 2019-07
+dist: trusty
 php:
   - '5.4'
   - '5.5'